#include <stdio.h>


int main()
{
    int p,q,r,s,count = 0;
    printf("The 4 fractions which sum id equal 1 are :\n");
    for(p = 2;p < 5;p++)
    {
        for(q = p;q < 7;q++)
        {
            for(r = q;r < 13;r++)
            {
                if((p*q*r - q*r - p*r - p*q) != 0)
                {
                    s = (p*q*r)/(p*q*r - q*r - p*r - p*q);
                    if(!((p*q*r)%(p*q*r - q*r - p*r - p*q)) && s>=r)
                    {
                        printf("[%2d] 1/%d+1/%d+1/%d+1/%d = 1\n",++count,p,q,r,s);
                    }
                }
            }
        }
    }

    return 0;
}

//熊贤豪